/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Called by internal engine systems after an Actor is removed from a cluster
void BroadcastHLODActorRemovedFromCluster ( const [AActor](API\Runtime\Engine\GameFramework\AActor) * InActor, const [AActor](API\Runtime\Engine\GameFramework\AActor) * ParentActor )